I actually do agree with you - but was trying to engage with the original argument on its own terms, and since eco issues haven't been taken into account there, I wasn't going to start. But I do agree. (7 billion, not 9, but that's a detail.)

In fact despite my comment, I have major reservations about large families. But a lot of that is very personal - the fact that I couldn't bear it ("bear" being a very pertinent word) shouldn't *necessarily* mean that it isn't the right choice for someone else. Except there's that whole population thing, and, yowch.